[dotnet] [bidi] Fix mismatch of proxy json property names

[nvborisenko]

Align with the spec.

💥 What does this PR do?

This pull request makes several naming consistency improvements to the BiDi session proxy configuration classes and properties. The main focus is on standardizing class and property names to match expected conventions.

Proxy configuration naming updates:

• Renamed the ProxyConfiguration property in CapabilityRequest to Proxy for clarity and consistency (dotnet/src/webdriver/BiDi/Session/CapabilityRequest.cs).
• Renamed the class AutoDetectProxyConfiguration to AutodetectProxyConfiguration and updated its usage in the [JsonDerivedType] attribute to match the new name (dotnet/src/webdriver/BiDi/Session/ProxyConfiguration.cs).
• Renamed the constructor parameter in PacProxyConfiguration from ProxyAutoConfigUrl to ProxyAutoconfigUrl for naming consistency (dotnet/src/webdriver/BiDi/Session/ProxyConfiguration.cs).

🔄 Types of changes

• Bug fix (backwards compatible)

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